USB Debugging Mode grants you a level of access to your device. What
kind of access, you may ask. This level of access that USB Debugging
Mode grants is important when you need system-level clearance, such as
when coding a new app. This mode, also called Developer Mode, allows
newly programmed apps to be copied via USB to the device for testing.
Depending on the OS version and installed utilities, the mode must be
turned on to let developers read internal logs.

But it does more
than that. There are a few non-development-related benefits of this
new level of access that can give you much more freedom of control over
your device. For example, with the Android SDK, you gain direct access to
your phone through your computer and that allows you to do things or run
terminal commands with ADB. These terminal commands can help you
restore a bricked phone. So this mode is a useful tool for any
adventurous Android owner.

This is a simple tutorial for you to enable "USB Debugging"
mode on any Android Smartphone, the method is compatible with old and new Samsung tablet/smartphones, Infinix, Gionee and Tecno smartphones that are running on Android 5.0, 5.0.1 Lollipop, Android 6.0 or 6.0.1 Marshmallow, Android 7.0, 7.1.1, 7.1.2 Nougat and the latest OS, Android 8.0 Oreo.

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To Enable USB Debugging On Any Device Running On Android Lollipop 5.0 or Higher